Overview
The JZZV1-10 is an integrated epoxy cast-resin combined metering transformer designed for 6kV and 10kV medium-voltage distribution systems. It features a three-phase two-element structure that combines electromagnetic voltage transformer (PT/VT) and current transformer (CT) units within a single epoxy cast-resin insulated body, suitable for both indoor and outdoor installations.
This unit delivers high-accuracy metering signals with VT accuracy class 0.2 and CT accuracy classes 0.2S or 0.5S, supporting active and reactive energy measurement on the high-voltage side of distribution transformers. It complies with GB/T 20840.1-2010, GB20840.4-2015, and IEC61869-4:2013 standards, making it ideal for utility, industrial, and user-side metering applications in 50Hz AC systems.
Key Ratings Snapshot
| Parameter | Rating |
|---|---|
| System voltage | 6kV / 10kV |
| Voltage class | 12kV |
| Frequency | 50Hz ±0.5Hz (60Hz optional) |
| VT ratio | 10 / 0.1kV |
| VT accuracy / burden | 0.2 — 2×20VA |
| CT primary current | 20A – 800A |
| CT secondary current | 5A or 1A |
| CT accuracy / burden | 0.2S or 0.5S — 2×15VA |
| Insulation level | 12/42/75kV |
| Construction | Epoxy cast-resin |
| Structure | Three-phase two-element combined |
| Weight | Approx. 105kg |
Model Designation
- J: Instrument transformer / voltage transformer family code
- Z: Cast-resin insulation or integrated structure code
- Z: Combined transformer / integrated metering structure code
- V: V/V voltage connection or two-element metering structure code
- 1: Design sequence code
- 10: Rated system voltage code for 10kV class applications
Construction
The JZZV1-10 features a monolithic epoxy cast-resin construction that encapsulates both voltage and current transformer elements into a single, robust housing. This integrated design ensures excellent dielectric strength, moisture resistance, and mechanical stability. The epoxy resin provides uniform insulation around all live parts, eliminating the need for oil or gas insulation. Primary and secondary terminals are embedded during casting for secure electrical connections, while a dedicated grounding terminal is provided for safety compliance. The solid, maintenance-free structure is suitable for long-term operation in harsh indoor or outdoor environments within the specified temperature and altitude limits.
Technical Parameters
Service Conditions
- Ambient Temperature: -25°C to +40°C
- Altitude: Up to 1000 m above sea level
- Relative Humidity: Daily average not exceeding 95%, monthly average not exceeding 90%
- Installation Environment: Indoor, non-corrosive, free from dust and conductive pollutants
- Seismic Intensity: Not exceeding 8 degrees (according to GB/T 13540)
Technical Parameters
The JZZV1-10 is a 10kV combined metering transformer designed for 12kV class systems, featuring epoxy cast-resin insulation. It operates within an ambient temperature range of -25°C to +40°C and at altitudes up to 1000 m, complying with relevant IEC and GB standards. The current transformer section supports primary currents from 20A to 800A with secondary options of 1A or 5A.
Voltage transformer Data
| Rated Voltage(kV) |
Rated insulation(kV) |
Accuracy class / Rated output (VA) |
Max. output (VA) |
|---|---|---|---|
| 10/0.1 | 12/42/75 | 0.2—2×20 | 300 |
Current transformer Data
| Rated primary current(A) |
Rated insulation(kV) |
Accuracy class / Rated output (VA) |
Rated short-time thermal current Ith(kA/s) |
Rated dynamic current Idyn(kA) |
|---|---|---|---|---|
| 20 | 12/42/75 | 0.2S—2×15VA 0.5S—2×15VA |
5/2 | 12.5 |
| 30-40 | 8/2 | 20 | ||
| 50-60 | 10/2 | 25 | ||
| 75 | 16/2 | 40 | ||
| 100-200 | 20/2 | 50 | ||
| 300-500 | 25/4 | 63 | ||
| 600-800 | 31.5/4 | 80 |
Installation & Wiring
Installation Diagram
The JZZV1-10 transformer is installed vertically on a mounting base using the main base length of 620mm. Mounting references at 320mm and 405mm from the drawing should be followed for secure fixation. Ensure adequate clearance around the unit for maintenance and compliance with phase spacing requirements (225mm + 225mm between top terminals). The overall dimensions—690mm length, 530mm height, and 405mm side width—must be considered during cabinet or enclosure planning.
Wiring Diagram
The wiring diagram illustrates the combined connection of the voltage transformer (PT) and current transformer (CT) for metering applications. PT secondary terminals provide voltage input to energy meters, while CT secondary terminals supply current input to both active and reactive energy meters. Terminal identification must be verified against the specified CT ratio, PT ratio, and polarity markings before commissioning. The secondary cable outlet is routed through the dedicated secondary outlet box and terminal wiring area. Note that CT secondary circuits must never be open-circuited during operation.
Selection & FAQs
Selection Guide
- Select JZZV1-10 for 6kV or 10kV distribution systems requiring a 12kV class combined metering transformer.
- Choose this unit when direct high-voltage side metering of active and reactive energy is needed using integrated voltage and current signals.
- Determine the CT primary current based on line load; available ranges include 20A, 30–40A, 50–60A, 75A, 100–200A, 300–500A, and 600–800A.
- Specify 0.2 voltage accuracy and 0.2S current accuracy for high-precision applications; use 0.5S where permitted by metering standards.
- Confirm secondary current requirement (5A or 1A) to match meter input specifications before production.
- Verify installation details including overall dimensions, 105kg weight, primary terminal position, secondary terminal box location, and cabinet mounting layout prior to drawing approval.
Frequently Asked Questions
Q1: What is the JZZV1-10 combined metering transformer used for?
It is designed for 10kV and 12kV indoor power systems requiring integrated voltage and current measurement. The epoxy cast-resin insulation ensures reliable performance in non-corrosive environments. Contact us for specific project applications.
Q2: Can the JZZV1-10 epoxy cast-resin transformer be installed outdoors?
No, it is strictly rated for indoor installation. The service conditions require a non-corrosive environment free from dust and conductive pollutants. Seismic intensity must also not exceed 8 degrees.
Q3: Which accuracy class does the voltage transformer section provide for metering?
The voltage transformer offers a 0.2 accuracy class with a rated output of 2×20 VA. This ensures precise measurement for 10/0.1kV systems up to a maximum output of 300 VA. Confirm specific burden requirements with our engineering team.
Q4: What primary current ranges are available for the current transformer section?
The current transformer supports primary currents ranging from 20A to 800A. Secondary options include 1A or 5A to match your protection and metering relay requirements. Rated short-time thermal current is available upon request.
Q5: Are routine factory tests performed before shipping the combined transformer?
Yes, standard routine tests are conducted to ensure compliance with IEC and GB standards. Specific type tests or special customer requirements are subject to confirmation. Request the test certificate schedule prior to dispatch.
Q6: How long is the lead time for custom current ratio orders?
Standard models ship according to our regular production schedule, while custom ratios require extended manufacturing time. Exact delivery timelines are subject to confirmation based on order quantity. Contact our sales team for an updated delivery estimate.